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// SPDX-License-Identifier: GPL-2.0
/*
* Huawei WMI laptop extras driver
*
* Copyright (C) 2018 Ayman Bagabas <ayman.bagabas@gmail.com>
*/
#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/wmi.h>
/*
* Huawei WMI GUIDs
*/
#define HWMI_EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"
/* Legacy GUIDs */
#define WMI0_EXPENSIVE_GUID "39142400-C6A3-40fa-BADB-8A2652834100"
#define WMI0_EVENT_GUID "59142400-C6A3-40fa-BADB-8A2652834100"
struct huawei_wmi {
struct input_dev *idev[2];
struct led_classdev cdev;
struct platform_device *pdev;
acpi_handle handle;
char *acpi_method;
};
struct huawei_wmi *huawei_wmi;
static const struct key_entry huawei_wmi_keymap[] = {
{ KE_KEY, 0x281, { KEY_BRIGHTNESSDOWN } },
{ KE_KEY, 0x282, { KEY_BRIGHTNESSUP } },
{ KE_KEY, 0x284, { KEY_MUTE } },
{ KE_KEY, 0x285, { KEY_VOLUMEDOWN } },
{ KE_KEY, 0x286, { KEY_VOLUMEUP } },
{ KE_KEY, 0x287, { KEY_MICMUTE } },
{ KE_KEY, 0x289, { KEY_WLAN } },
// Huawei |M| key
{ KE_KEY, 0x28a, { KEY_CONFIG } },
// Keyboard backlit
{ KE_IGNORE, 0x293, { KEY_KBDILLUMTOGGLE } },
{ KE_IGNORE, 0x294, { KEY_KBDILLUMUP } },
{ KE_IGNORE, 0x295, { KEY_KBDILLUMUP } },
{ KE_END, 0 }
};
static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct huawei_wmi *huawei = dev_get_drvdata(led_cdev->dev->parent);
acpi_status status;
union acpi_object args[3];
struct acpi_object_list arg_list = {
.pointer = args,
.count = ARRAY_SIZE(args),
};
args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
args[1].integer.value = 0x04;
if (strcmp(huawei->acpi_method, "SPIN") == 0) {
args[0].integer.value = 0;
args[2].integer.value = brightness ? 1 : 0;
} else if (strcmp(huawei->acpi_method, "WPIN") == 0) {
args[0].integer.value = 1;
args[2].integer.value = brightness ? 0 : 1;
} else {
return -EINVAL;
}
status = acpi_evaluate_object(huawei->handle, huawei->acpi_method, &arg_list, NULL);
if (ACPI_FAILURE(status))
return -ENXIO;
return 0;
}
static void huawei_wmi_leds_setup(struct device *dev)
{
struct huawei_wmi *huawei = dev_get_drvdata(dev);
huawei->handle = ec_get_handle();
if (!huawei->handle)
return;
if (acpi_has_method(huawei->handle, "SPIN"))
huawei->acpi_method = "SPIN";
else if (acpi_has_method(huawei->handle, "WPIN"))
huawei->acpi_method = "WPIN";
else
return;
huawei->cdev.name = "platform::micmute";
huawei->cdev.max_brightness = 1;
huawei->cdev.brightness_set_blocking = &huawei_wmi_micmute_led_set;
huawei->cdev.default_trigger = "audio-micmute";
huawei->cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
huawei->cdev.dev = dev;
huawei->cdev.flags = LED_CORE_SUSPENDRESUME;
devm_led_classdev_register(dev, &huawei->cdev);
}
/* Input */
static void huawei_wmi_process_key(struct input_dev *idev, int code)
{
const struct key_entry *key;
/*
* WMI0 uses code 0x80 to indicate a hotkey event.
* The actual key is fetched from the method WQ00
* using WMI0_EXPENSIVE_GUID.
*/
if (code == 0x80) {
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
status = wmi_query_block(WMI0_EXPENSIVE_GUID, 0, &response);
if (ACPI_FAILURE(status))
return;
obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER)
code = obj->integer.value;
kfree(response.pointer);
}
key = sparse_keymap_entry_from_scancode(idev, code);
if (!key) {
dev_info(&idev->dev, "Unknown key pressed, code: 0x%04x\n", code);
return;
}
sparse_keymap_report_entry(idev, key, 1, true);
}
static void huawei_wmi_input_notify(u32 value, void *context)
{
struct input_dev *idev = (struct input_dev *)context;
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
status = wmi_get_event_data(value, &response);
if (ACPI_FAILURE(status)) {
dev_err(&idev->dev, "Unable to get event data\n");
return;
}
obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER)
huawei_wmi_process_key(idev, obj->integer.value);
else
dev_err(&idev->dev, "Bad response type\n");
kfree(response.pointer);
}
static int huawei_wmi_input_setup(struct device *dev,
const char *guid,
struct input_dev **idev)
{
*idev = devm_input_allocate_device(dev);
if (!*idev)
return -ENOMEM;
(*idev)->name = "Huawei WMI hotkeys";
(*idev)->phys = "wmi/input0";
(*idev)->id.bustype = BUS_HOST;
(*idev)->dev.parent = dev;
return sparse_keymap_setup(*idev, huawei_wmi_keymap, NULL) ||
input_register_device(*idev) ||
wmi_install_notify_handler(guid, huawei_wmi_input_notify,
*idev);
}
static void huawei_wmi_input_exit(struct device *dev, const char *guid)
{
wmi_remove_notify_handler(guid);
}
/* Huawei driver */
static const struct wmi_device_id huawei_wmi_events_id_table[] = {
{ .guid_string = WMI0_EVENT_GUID },
{ }
};
static int huawei_wmi_probe(struct platform_device *pdev)
{
const struct wmi_device_id *guid = huawei_wmi_events_id_table;
int err;
platform_set_drvdata(pdev, huawei_wmi);
huawei_wmi->pdev = pdev;
while (*guid->guid_string) {
struct input_dev *idev = *huawei_wmi->idev;
if (wmi_has_guid(guid->guid_string)) {
err = huawei_wmi_input_setup(&pdev->dev, guid->guid_string, &idev);
if (err) {
dev_err(&pdev->dev, "Failed to setup input on %s\n", guid->guid_string);
return err;
}
}
idev++;
guid++;
}
huawei_wmi_leds_setup(&pdev->dev);
return 0;
}
static int huawei_wmi_remove(struct platform_device *pdev)
{
const struct wmi_device_id *guid = huawei_wmi_events_id_table;
while (*guid->guid_string) {
if (wmi_has_guid(guid->guid_string))
huawei_wmi_input_exit(&pdev->dev, guid->guid_string);
guid++;
}
return 0;
}
static struct platform_driver huawei_wmi_driver = {
.driver = {
.name = "huawei-wmi",
},
.probe = huawei_wmi_probe,
.remove = huawei_wmi_remove,
};
static __init int huawei_wmi_init(void)
{
struct platform_device *pdev;
int err;
huawei_wmi = kzalloc(sizeof(struct huawei_wmi), GFP_KERNEL);
if (!huawei_wmi)
return -ENOMEM;
err = platform_driver_register(&huawei_wmi_driver);
if (err)
goto pdrv_err;
pdev = platform_device_register_simple("huawei-wmi", -1, NULL, 0);
if (IS_ERR(pdev)) {
err = PTR_ERR(pdev);
goto pdev_err;
}
return 0;
pdev_err:
platform_driver_unregister(&huawei_wmi_driver);
pdrv_err:
kfree(huawei_wmi);
return err;
}
static __exit void huawei_wmi_exit(void)
{
platform_device_unregister(huawei_wmi->pdev);
platform_driver_unregister(&huawei_wmi_driver);
}
module_init(huawei_wmi_init);
module_exit(huawei_wmi_exit);
MODULE_DEVICE_TABLE(wmi, huawei_wmi_events_id_table);
MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
MODULE_DESCRIPTION("Huawei WMI laptop extras driver");
MODULE_LICENSE("GPL v2");
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